Frommer's Review
Of all ancient Rome's great buildings, only the Pantheon (All the Gods) remains intact. It was built in 27 B.C. by Marcus Agrippa and was reconstructed by Hadrian in the early 2nd century A.D. This remarkable building, 43m (142 ft.) wide and 43m (142 ft.) high (a perfect sphere resting in a cylinder) and once ringed with white marble statues of Roman gods in its niches, is among the architectural wonders of the world because of its dome and its concept of space. Hadrian himself is credited with the basic plan, an architectural design that was unique for the time. The dome, a perfect hemisphere of cast concrete, rests on a solid ring wall, supporting this massive structure. Before the 20th century, this was the biggest pile of concrete ever constructed. The ribbed dome outside is a series of almost weightless cantilevered brick. Animals were sacrificed and burned in the center, and the smoke escaped through the only means of light, the oculus, an opening at the top 5.4m (18 ft.) in diameter. Michelangelo came here to study the dome before designing the cupola of St. Peter's (whose dome is .6m/2 ft. smaller than the Pantheon's). The walls are 7.5m (25 ft.) thick, and the bronze doors weigh 20 tons each. About 125 years ago, Raphael's tomb was discovered here (fans still bring him flowers). Vittorio Emanuele II, king of Italy, and his successor, Umberto I, are interred here as well.
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